无论我们在国内还是国外服务商购买的云服务器，拿到手需要做的事情就是检查硬盘有没有挂载，同时需要update检查源升级最新软件包。这里我们经常有使用的主机商镜像都是比较老的或者是原生态的，镜像源都比较陈旧或者更新出现错误，于是我们会去修改国内的镜像源。

vim /etc/apt/sources.list

源地址在系统这个位置，我们可以将原来的系统自带的备份一份，然后再修改下面一些可选择的。

阿里云镜像：

deb http://mirrors.aliyun.com/debian/ stretch main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ stretch main non-free contrib
deb http://mirrors.aliyun.com/debian-security stretch/updates main
deb-src http://mirrors.aliyun.com/debian-security stretch/updates main
deb http://mirrors.aliyun.com/debian/ stretch-updates main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ stretch-updates main non-free contrib
deb http://mirrors.aliyun.com/debian/ stretch-backports main non-free contrib
deb-src http://mirrors.aliyun.com/debian/ stretch-backports main non-free contrib

华为云镜像：

deb https://mirrors.huaweicloud.com/debian/ stretch main contrib non-free
deb-src https://mirrors.huaweicloud.com/debian/ stretch main contrib non-free
deb https://mirrors.huaweicloud.com/debian/ stretch-updates main contrib non-free
deb-src https://mirrors.huaweicloud.com/debian/ stretch-updates main contrib non-free
deb https://mirrors.huaweicloud.com/debian/ stretch-backports main contrib non-free
deb-src https://mirrors.huaweicloud.com/debian/ stretch-backports main contrib non-free

163镜像：

deb http://mirrors.163.com/debian/ stretch main non-free contrib
deb http://mirrors.163.com/debian/ stretch-updates main non-free contrib
deb http://mirrors.163.com/debian/ stretch-backports main non-free contrib
deb-src http://mirrors.163.com/debian/ stretch main non-free contrib
deb-src http://mirrors.163.com/debian/ stretch-updates main non-free contrib
deb-src http://mirrors.163.com/debian/ stretch-backports main non-free contrib
deb http://mirrors.163.com/debian-security/ stretch/updates main non-free contrib
deb-src http://mirrors.163.com/debian-security/ stretch/updates main non-free contrib

上交大镜像：

deb https://mirror.sjtu.edu.cn/debian/ stretch main contrib non-free
deb-src https://mirror.sjtu.edu.cn/debian/ stretch main contrib non-free
deb https://mirror.sjtu.edu.cn/debian/ stretch-updates main contrib non-free
deb-src https://mirror.sjtu.edu.cn/debian/ stretch-updates main contrib non-free
deb https://mirror.sjtu.edu.cn/debian/ stretch-backports main contrib non-free
deb-src https://mirror.sjtu.edu.cn/debian/ stretch-backports main contrib non-free
deb https://mirror.sjtu.edu.cn/debian-security/ stretch/updates main contrib non-free
deb-src https://mirror.sjtu.edu.cn/debian-security/ stretch/updates main contrib non-free

中科大镜像：

deb https://mirrors.ustc.edu.cn/debian/ stretch main contrib non-free
deb-src https://mirrors.ustc.edu.cn/debian/ stretch main contrib non-free
deb https://mirrors.ustc.edu.cn/debian/ stretch-updates main contrib non-free
deb-src https://mirrors.ustc.edu.cn/debian/ stretch-updates main contrib non-free
deb https://mirrors.ustc.edu.cn/debian/ stretch-backports main contrib non-free
deb-src https://mirrors.ustc.edu.cn/debian/ stretch-backports main contrib non-free
deb https://mirrors.ustc.edu.cn/debian-security/ stretch/updates main contrib non-free
deb-src https://mirrors.ustc.edu.cn/debian-security/ stretch/updates main contrib non-free

更换源之后，我们执行脚本：

apt-get update -y

更新如果没有报错那就说明源没有问题，如果有报错我们可以更换直到没有问题的。